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Redefining the meaning of cold-hardy evergreens:
Early November of 2014 brought one of the most dramatic temperature drops ever recorded in Central Wyoming. Temperatures hovered around 70 degrees throughout October and early November, and then the temperature dropped to -25 degrees in just a few days—a 90+ degree drop. Many plants including some evergreens were still in the process of going dormant.

They do this by reducing the amount of water stored in their cells and increasing the sugar content (a tree’s method of developing anti-freeze for the cold of winter). The problem was they hadn’t developed their anti-freeze; they had too much water in their cells. We all know when water freezes, it expands; in the case of trees the water burst the cell walls and literally destroyed the vascular system of the affected trees making it impossible for trees to move food and water. This was the equivalent to hemorrhaging in humans. Many trees died.

Yet, there were evergreen trees that never showed any stress whatsoever. The Wyoming Plant Company is pleased to offer our customers hand-picked selections that can handle such harsh conditions including our abundant winds.

Throughout this site, the following are used as guidelines for watering established plants:

These truly xeric plants can live with our 12 inches of natural annual precipitation and only need a winter watering during a multi-year drought, but they will thrive with a monthly watering. Overwatering will kill some of these.

These plants are adapted to intermittent deep
watering with soil drying to a depth of a few inches between waterings. Watering frequency may be every couple of weeks during the active growing season and maybe only one winter watering for optimal care.

These plants need regular watering somewhat like a bluegrass lawn so that
they never dry to depth in the root system during the active growing season, and need occasional winter watering to prevent root dessication and resultant plant
death.